TLE8102SG_12 Datasheet, PDF (17/34 Pages) Infineon Technologies AG – Smart Dual Channel Powertrain Switch

TLE 8102 SG
Smart Dual Channel Powertrain Switch
Electrical and Functional Description of Blocks
5.4
Diagnostic Functions
The TLE8102SG provides diagnosis information about the device and about the load. The following diagnosis
functions are implemented:
• The protective functions (flags CLn and Tn) of channel n are registered in the diagnosis flag Pn.
• The open load diagnosis of channel n is registered in the diagnosis flag OLn.
• The under current diagnosis of channel n is registered in the diagnosis flag UCn.
• The short to ground monitor information of channel n is registered in the diagnosis flag SGn
The diagnosis information of the TLE8102SG can either be accessed by status (ST) pins or the SPI interface
and/or fault pin. With the exception of over temperature, a fault is only recognized if it lasts longer than the fault
delay time t_d(fault). If using the status pins for diagnosis, the status pins change state in normal operation to match
the input signal of the corresponding channel. If a fault condition appears and the fault delay time elapses, the
status pin for the channel shows the inverted input signal. This diagnosis flag is not latched. Therefore, if the fault
condition is removed, the status pins will indicate normal operation.
Unlike the status pins, when using the SPI interface and/or fault pin, diagnosis flags are latched in the diagnosis
register of the SPI interface. In this case, diagnosis flags are cleared by the rising edge of the CS signal after a
successful SPI transmission.
Please see Table 1 and Figure 13 for details.
Table 1 Diagnostic Information
Operating Condition
Control Power Filter
Input
Output Time
Status
Output
Fault
Output
Channel
Diagnosis
Bits
MSB, LSB
Channel
Overtemp.
Flag
Sleep Mode
x
off
–
L
H
––
–
Normal Operation
L
H
off
–
on
L
H
H, H
L
H
H
H, H
L
Short to ground
L
off
t_d(fault)
H
L
L, L
L
H
on
t_d(fault)
L
L
L, H
L
Open load,
Under current.¹⁾
L
off
t_d(fault)
H
L
L, H
L
H
on
t_d(fault)
L
L
L, H
L
Over load (current limit 1, H
on
t_d(fault)
L
L
H, L
L
current limitation)¹⁾
Over load (current limit 2, H
off
t_d(off)
L
L
H, L
L
latching shutdown)²⁾
Overtemp. (autorestart) H
off³⁾
–
L
L
H, L
H
Overtemp. (latching
H
off⁴⁾
–
L
L
H, L
H
shutdown)
1) Short to ground/open load/ under current /overload/short-to-supply - events shorter than min. time t_d(fault) will not be
latched and not reported at the diagnosis pins.
2) Overload/short-to-supply - events shorter than min. time t_d(off) will not be latched and not reported at the diagnosis pins.
3) Off as long as overtemperature occurs, restart after cooling down.
4) Shutdown latch reset by falling input edge.
Data Sheet
17
V1.5, 2012-08-17